Abstract
AbstractThe formation of complex species between lead and TAPSO, a commercialized biological buffer, was evidenced and discussed. Formation constants of Pb(TAPSO)x(OH)y system have been studied by direct current polarography and by glass electrode potentiometry at fixed total–ligand and total–metal concentration ratio and varied pH, at 25.0 °C and ionic strength set to 0.1 M KNO3. The graphic analysis revealed to be a very powerful tool in the prediction and refinement operations of Pb–(TAPSO)x(OH)y system. The proposed final model for this system is: PbL, PbL2, PbL2(OH) and PbL2(OH)2, with stability constants values, as log β, of 3.7±0.1, 6.6±0.1, 12.9±0.1 and 17.8±0.1, respectively.
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